Cutter-grinding machine.



H. E. EBERHARDT.

CUTTER GRINDING MACHINE.

APPLICATION FILED OUT. 5, 1910.

Patented Mar. 21, 1911.

2 BHEETS SHEET 1.

H. B. EBERHARDT.

CUTTER GRINDING 111101111111.

APPLICATION TILED 0016' 1910.

987,449. Patented Mar. 21, 1911.

2 BHEETS-BHEBT 2.

HENRY E. EBEBHARDT, OF NEWARK, NEW JERSEY.

CUTTER-GRINDING MACHINE.

Application filed October 6, 1910.

To all whom it may concern:

Be it known that I, HENRY E. Ennnrmnn'r, a citizen of the United States, and a resident of Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Cutter-Grinding Machines, of which the following is a specification.

The invention relates to cutter grinding machines in which relieved form cutters are sharpened on their radial cutting faces; and particularly to machines employed for sharpening the rotary cutters used on milling, gear and rack cutting machines, which cutters retain their original form after grinding. In cutter grinders of this type, as heretofore constructed, it has been a difficult and tedious operation to grind cutters having a strengthening web of metal between the cutter teeth, the said web extending toward the periphery of the cutter and beyond the bottom of the cutting edges, and thus necessitating more than a mere single passing of the grinding wheel to sharpen both sides of the same tooth.

The present invention has for its object to provide an accurate and simple mechanism whereby such webbed rotary cutters may be conveniently ground, as well as to simplify the grinding of rotary cutters having no web.

It has for its further object to provide improved means for indexing the cutter, as well as means to effect the radial feeding of the cutter to be ground.

The 'nature of my invention will be best understood when described in connection with the accompanying drawings, in which- Figure 1 is a side elevation showing my improved machine mounted upon a suitable column (broken away). Fig. 2 is a plan of the same. Figs. 3 and 4 are respectively a plan and side elevation of a gage plate for locating the grinder with respect to the cutter, the manner of applying the same being illustrated in Fig. 3. Fig. 5 is an enlarged detail view of the indexing and feeding mechanism. Fig. 6 is a fragmentary view of the grinder in different operative positions and with the cutter presented in three different positions thereto.

Similar characters of reference designate corresponding parts throughout the several views.

Referring now to the drawings, 10 desig- Specification of Letters Patent.

Patented Mar. 21, 1911.

Serial No. 585,586.

The grinding wheel 14 is secured to a spindle 15 by means of a nut 16, and revolves freely in bearings 17 mounted in a slide 18. Power is transmitted through a pulley 19 secured to spindle 15 through screw 20, and the slide 18 is adapted to be reciprocated toward and away from the table 10, by means of a hand lever 21, on a bearing 22 which is secured so as to be integral with refuse-pan 23, as at points 24, by means of screws 25. Lever 21 connects with the slide 18 through a link 26 and pins 27 and 28, the lever being fulcrumed about a pin 29 at the bearing 22. The extent of the movement of the grinding wheel 14 toward the table 10 may be regulated by means of an adjustable stop 30, arranged in the wall of the refuse-pan 23, and against which a lug 31 from the grinding mechanism is adapted to strike. Various .lengths of grinding stroke may thus be given to the grinding wheel 14, which wheel is partly surrounded by a guard 32, adjustable concentrically with respect to the said grinding wheel, to protect the operator from flying particles.

The slide 11 carries a stud 35 upon which the cutter 36 to be groundis adapted to be mounted, a bushing 37 being provided for cutters having holes of larger diameter than the said stud 35. Slide 11 is so adjusted by means of the adjusting screw 13 that the axis of cutter 36 is brought into the plane of the cutting edge 38 of the grinding wheel 14. To determine this position with accuracy and to correct for wear of the grinding wheel I employ a gage 39 (Figs. 3 and 4) provided with faces 40 and 41, the former being adapted to contact with the said rinding edge 38 and the latter with the s1de of the slide 11 to set the cutter stud on line with the edge of the grinding wheel.

From the table 10 extends an arm 45 terminating in a finage 46 having a finished surface 47. A hand lever 48 extends from the arm 45 and the latter may be tilted thereby, and with it the cutter to be ground, about an axis parallel to the grinding wheel to bring the cutter into coincidence with the grinding wheel. The table 10 may then be locked in any suitable manner in any positurned to draw the surface 47 toward and to clamp the same against a corresponding surface 53 provided on a boss 54 integral with or suitably secured to the said pan 23. In providing the slot 50, it becomes possible, also, to effect an adjustment of the table as a whole toward and from the said grinding wheel 1 The indexing or dividing and the feeding of the cutter may be effected by any suitable mechanism; but I prefer to employ the mechanism herein shown and which consists essentially of an adjustable indexing pawl carried by the slide 11 and arranged for fur ther adjustment for the purpose of feeding the cutter. To this end a suitable carrier 60 is secured to the slide 11 through slot 61 and clamping screw 62, by means of which the same may be adjusted to various diameters of cutters. This carrier supports a slide 63 which is adjustable relatively to the said carrier by means of an adjusting screw 64 and is secured thereto by means of screw 69 sliding in slot 70. To the said slide 63 is pivotally connected through a pin 71 a pawl holder 65 in which the pawl 66 is held by means of a set screw 67, the said holder be ing held in its normal position by means of a spring 68 secured to the said holder and to the slide 63. Pawl 66 is adjustable for various sizes of teeth through the set screw 67.

Referring now to Fig. 6 and in particularto the position of the cutters shown in full lines, in which position the said cutter lies substantially in the same plane with the axis of the grinding wheel, a non-webbed cutter may be ground in the manner well-known in the art in one setting. The present invention, however, permits of adjusting for cutter height without the use of packing collars and for the diameter of the cutter, as well as for the feeding and indexing of the same. The adjustment for height and diameter of cutter is accomplished by loosening lever 52 and tilting the table 10 by means of lever 48. By a combined manual manipulation of these levers, the cutter is thus almost instantly brought to the desired grinding position, after which the lever 52 is turned to lock the table in this position.

In Fig. 6 the upper and the lower dotted position of the cutter show the two positions necessary to grind both sides of the web of cutter 36. Two dotted positions of the grinding wheel are also shown, one of each side of the Web. Two settin s, one for each side, are all that are usua ly required to at the same time usually grinds the central portion of the cutter sulficiently for its cut ing purposes. These settings are made in the same manner as for non-webbed cutters, the tilting of the table being carried as far as the curve of the web may require. The tilting of the table also provides a means whereby heavy pitch cutters may be ground in the corners at the sides without changing the grinding wheel or removing the cutter from the table. The cutter being ground, further more, is always in view of the operator.

The indexing of the cutter is effected in the usual manner by turning the cutter by hand, the pawl snapping over the teeth, and then holding the back of a tooth against the said pawl. The adjustment for diameter of the cutter is made by sliding the carrier 60 to suit the said diameter; and the size of the tooth is allowed for by adjusting the pawl with respect to its said holder. After the adjustment is once made the amount of material to be removed is determined by feeding the pawl in the direction of the grinding wheel by means of the feed screw 64. This feed mechanism provides for the cutter being always presented to the grinding wheel in such a manner as to insure radially ground surfaces, which radially ground surfaces are essential in perpetuating original shapes of cutters in the type herein described.

I claim 1. In a machine for grinding cutters: a suitable grinding wheel; a cutter carriage, and means to effect a relative angular adjustment between the grinder and the cutter carriage, whereby either side or both sides of the cutter face may be ground; and means to effecta relative movement between said grinding wheel and said cutter carriage for the purpose of grinding the cutter.

In a machine for grinding cutters: a suitable grinding wheel; a cutter carriage, and means to angularly adjust the cutter carriage, whereby either side or both sides 'of the cutter face may be ground; and means to reciprocate said grinding wheel toward and away from said cutter carriage for the purpose of grinding the cutter.

3. In a machine for grinding cutters: a suitable grinding wheel; a table, and suitable means thereon to support the cutter to be ground; means to tilt said table about an axis parallel to the axis of the said grinding wheel; means to lock said table; and means to reciprocate said grinding wheel toward and away from said table.

4. In a machine for grinding cutters: a suitable grinding wheel; a table, and a slide or carriage adjustable parallel to the axis of the said grinding wheel; a. stud on said slide or carriage to retain the cutter to be ground; means to tilt said table about an grind a webbed cutter, as the grinding wheel axis parallel to the axis of the said grinding wheel; means to lock said table; and means to reciprocate said grinding wheel toward and away from the said table.

5. In a machine for grinding cutters: a suitable grinding wheel; a table, and suitable means thereon to support the cutter to be ground; an arm extending from said table, and provided with a clamping surface; a hand lever on said arm whereby the said table may be tilted; a fixed member for said arm provided with a clamping surface adapted to cooperate with the clamping surface of said arm; a stud extending from said arm through said fixed Inember; and a clamping member adapted to operate on said. stud to clamp said surfaces together.

6. In a machine for grinding cutters: a suitable grinding wheel; a table and suitable means thereon to support the cutter to be ground; an arm extending from said table and provided with a clamping surface; a hand lever on said arm to tilt said table; a refuse-pan provided with a clamping surface adapted to cooperate with the clamping surface of said arm; a stud extending from said arm through said refuse-pan; a clamping nut adapted to operate on said stud to clamp said surfaces together; and a suitable hand lever connected with said nut to turn the same.

7. In a machine for grinding cutters: a suitable grinding wheel; a table, and suitable means thereon to support the cutter to be ground; an arm extending from said table and provided with a clamping surface; a hand lever on thesaid arm to tilt said table; a refuse-pan provided with a slot, and with a clamping surface adapted to cooperate with the clamping surface of said arm; a stud extending from said arm through the slot in said refuse-pan; a clamping nut adapted to operate on said stud to clamp the said surfaces together; and a suitable hand lever connected with said nut to turn the same.

8. In a machine for grinding cutters: a suitable grinding wheel; a cutter carriage, and means to effect a relative angular adjustment between the grinder and the cutter carriage, whereby either side or both sides of the cutter face may be ground; means to effect a relative movement between said grinding wheel and said cutter carriage for the purpose of grinding the cutter; and in dexing means for the cutter and carried by said cutter carriage.

9. In a machine for grinding cutters: a suitable grinding wheel; a cutter carriage, and means to tilt the same toward and away from said grinding wheel about an axis parallel to the axis of the grinding wheel, whereby either side or both sides of the cutter face may be ground; means to reciprocate'said grinding wheel toward and away from said cutter carriage; and indexing means for the cutter and carried by said cutter carriage.

10. In a machine for grinding cutters: a suitable grinding wheel; a cutter carrier adjustable about an axis parallel to the axis of the grinding wheel; indexing means for said cutter and carried by said cutter carrier; and means whereby said indexing means may be adjusted relatively to the said cutter carrier.

11.. In a machine for grinding cutters: a suitable grinding wheel; a cutter carrier adjustable about an axis parallel to the axis of the grinding wheel; indexing means for said cutter and carried by said cutter carrier; and means whereby said indexing means may be adjusted at right angles to said cutter carrier.

12. In a machine for grinding cutters: a suitable grinding wheel; a cutter carrier adjustable about an axis parallel to the axis of the grinding wheel; indexing means for said cutter and carried by said cutter carrier; and means whereby said indexing means may be adjusted at right angles to and parallel to said cutter carrier.

13. In a machine for grinding cutters and the like: a suitable grinding Wheel; a cutter carrier, and means to tilt the same toward and away from said grinding wheel about an axis parallel to the axis of the grinding wheel, whereby either side or both sides of the cutter may be ground; and means carried by said cutter carrier to effect the radial feeding of said cutter.

14. In a machine for grinding cutters: a suitable grinding wheel; a cutter carrier adjustable about an axis parallel to the axis of the grinding wheel; means carried by said cutter carrier to effect the feeding of said cutter; and indexing means for said cutter and carried by said cutter carrier.

15. In a machine for grinding cutters: a suitable grinding wheel; a table, and a slide or carriage adjustable parallel to the axis of the grinding wheel; and indexing means for the cutter carried by said slide.

16. In a machine for grinding cutters: a suitable grinding wheel; a table, and a slide or carriage adjustable parallel to the axis of the grinding wheel; indexing means for the cutter and carried by said slide; and means to adjust said indexing means independently of said slide.

17. In a machine for grinding cutters: a suitable grinding wheel; a table, and a slide or carriage adjust-able parallel to the axis of the grinding wheel; indexing means for the cutter and carried by said slide; and means whereby said indexing means may be adjusted at right angles to and parallel to the said slide to accommodate cutters of different diameters and of diiferent sizes of teeth.

18. In a machine for grinding cutters: a suitable grinding wheel; a table, and a slide or carriage adjustable parallel to the axis of the grinding wheel; indexing means for the cutte' and carried by said slide; means whereby said indexing means may be adjusted at rightangles to and parallel to the said slide to accommodate cutters of different diameters; and means to determine the extent of the grinding.

19. In a machine for grinding cutters: a suitable grinding wheel; a table, and an adjustable slide or carriage; an indexing pawl for the cutter and carried by the said slide; and means to adjust the said pawl with respectto the cutter.

20. In a machine for grinding cutters: a suitable grinding wheel; a table, and an adjustable slide or iarriage; an indexing pawl for the cutter; a pawl holder; a carriage for said pawl holder; and means to adjust said pawl holder with respect to its said carriage to feed the said cutter.

21. In a machine for grinding cutters: a suitable grinding wheel; a table, and an adjustable slide or carriage; an indexing pawl for the cutter; a pawl holder; an adjustable carriage for said pawl holder; and

means to adjust said pawl holder with respect to its said carriage to feed the said. cutter.

22. In a machine for grinding cutters: a suitable grinding wheel; a table, and an adjustable slide or carriage; an indexing pawl for the cutter; a pawl holder; and means whereby said pawl may be adjusted wit-h respect to its said holder.

23. In a machine for grinding cutters: a suitable grinding wheel; a table, and an adjustable slide or carriage; an indexing pawl for the cutter; a pawl holder; means whereby the said pawl may be adjusted with re spect to its said holder; an adjustable carri age for said pawl holder; and means to adjust said pawl holder with respect to its said carriage to feed the said cutter.

Signed at Newark, in the county of Essex and State of New Jersey this 4th day of October A. D. 1910.

HENRY E. EBERHARDT.

Vitnesses HENRY J. EBERHARDT, FRANK E. EBERHARDT.

Copies of thispatent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. v 

